jar文件是具有特定模式的zip文件。您可以使用ZipFile和ZipEntry或其子类JarFile和JarEntry。
此代码（自定义类加载器的方法）将返回一个Map，其中包含您需要的每种“类”类型的数组。
public Map<String, List<Class<?>>> loadAndScanJar(File jarFile) throws ClassNotFoundException, ZipException, IOException { // Load the jar file into the JVM // You can remove this if the jar file already loaded. super.addURL(jarFile.toURI().toURL()); Map<String, List<Class<?>>> classes = new HashMap<String, List<Class<?>>>(); List<Class<?>> interfaces = new ArrayList<Class<?>>(); List<Class<?>> clazzes = new ArrayList<Class<?>>(); List<Class<?>> enums = new ArrayList<Class<?>>(); List<Class<?>> annotations = new ArrayList<Class<?>>(); classes.put("interfaces", interfaces); classes.put("classes", clazzes); classes.put("annotations", annotations); classes.put("enums", enums); // Count the classes loaded int count = 0; // Your jar file JarFile jar = new JarFile(jarFile); // Getting the files into the jar Enumeration<? extends JarEntry> enumeration = jar.entries(); // Iterates into the files in the jar file while (enumeration.hasMoreElements()) { ZipEntry zipEntry = enumeration.nextElement(); // Is this a class? if (zipEntry.getName().endsWith(".class")) { // Relative path of file into the jar. String className = zipEntry.getName(); // Complete class name className = className.replace(".class", "").replace("/", "."); // Load class definition from JVM Class<?> clazz = this.loadClass(className); try { // Verify the type of the "class" if (clazz.isInterface()) { interfaces.add(clazz); } else if (clazz.isAnnotation()) { annotations.add(clazz); } else if (clazz.isEnum()) { enums.add(clazz); } else { clazzes.add(clazz); } count++; } catch (ClassCastException e) { } } } System.out.println("Total: " + count); return classes;}
